It is also very hard to pick a valuable card "in the long run" currently the most expensive Myr card is the Myr Superion. But that could change with the Myr cards used in different formats.
If by Myr you mean megayear then "mega" is the SI prefix that represents a factor of one million. Therefore a megayear is one million years.
MYR
Malaysia. Sometimes they also used MYR. RM stands for Ringgit Malaysia in the Malaysian language. When in English, it becomes MYR where MY is usually associated as the country code anywhere in the world and the R is still Ringgit, hence MYR=Malaysian Ringgit.
An eon is a made up of two or more eras. They are defined in terms of what was happening on the planet in biological and geological terms rather than in number of years. We are now 541 million yeras (Myr) into the current eon - the Phanerozoic eon. Before that was the Proterozoic eon which lasted 1959 Myr, the Archean eon (1500 Myr) and the oldest, the Hadean eon (500 Myr).
myriad
Malaysian Ringgit (MYR).
σμαράγδι (is-MYR-al-dee)
20 MYR.
MYR - Malaysia Ringgit
300
There are six acronyms with the letters MYR. They are: Malaysian Ringgit, million years, Myrtle Beach, mid rear review, mean year and milk yield response.